ER390 brand manufacturers: SEIKO, Twicea stock, ER390 reference price.SEIKO. ER390 parameters, ER390 Datasheet PDF and pin diagram description download.You can use the ER390 Accessories, DSP Datesheet PDF, find ER390 pin diagram and circuit diagram and usage method of function,ER390 electronics tutorials.You can download from the Twicea.